Lee DeHihns is a member of the firm's Environmental & Land Development Group and co-chair of the group's Climate & Sustainability Team. He concentrates on regulatory and defensive litigation matters, including climate change, corporate compliance, debarment, white-collar criminal defense, air quality, hazardous waste, wetlands and water quantity and quality matters for industrial and municipal clients. He was chair of the American Bar Association's Section of Environment, Energy and Resources (SEER) in 2007-2008 and is a SEER delegate to the ABA House of Delegates (2009-2012). Mr. DeHihns was ranked as a leading environmental lawyer in Chambers USA: America's Leading Lawyers for Business (2006-2011). He wrote a chapter titled “Constitutional Influences on Climate Litigation” in the ABA's Principles of Constitutional Environmental Law published in September 2011.

Mr. DeHihns joined the firm in 1990 after serving four years as the deputy regional administrator of USEPA Region 4, the agency's senior career position in the Southeast. His career began with USEPA in 1974 in Washington, D.C., where he rose to the position of associate general counsel. Mr. DeHihns received a Senior Executive Service Meritorious Rank Award from President Bush in 1989. He is on the Board of Trustees of Marywood University (2009-2012).